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Radyk MD, Nelson BS, Halbrook CJ, Wood A, Lavoie B, Salvatore L, Corfas G, Colacino JA, Shah YM, Crawford HC, Lyssiotis CA. Glucose-6-phosphate dehydrogenase deficiency accelerates pancreatic acinar-to-ductal metaplasia. bioRxiv 2023:2023.11.06.565895. [PMID: 37986898 PMCID: PMC10659312 DOI: 10.1101/2023.11.06.565895] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2023]
Abstract
Activating mutations in KRAS extensively reprogram cellular metabolism to support the continuous growth, proliferation, and survival of pancreatic tumors. Targeting these metabolic dependencies are promising approaches for the treatment of established tumors. However, metabolic reprogramming is required early during tumorigenesis to provide transformed cells selective advantage towards malignancy. Acinar cells can give rise to pancreatic tumors through acinar-to-ductal metaplasia (ADM). Dysregulation of pathways that maintain acinar homeostasis accelerate tumorigenesis. During ADM, acinar cells transdifferentiate to duct-like cells, a process driven by oncogenic KRAS. The metabolic reprogramming that is required for the transdifferentiation in ADM is unclear. We performed transcriptomic analysis on mouse acinar cells undergoing ADM and found metabolic programs are globally enhanced, consistent with the transition of a specialized cell to a less differentiated phenotype with proliferative potential. Indeed, we and others have demonstrated how inhibiting metabolic pathways necessary for ADM can prevent transdifferentiation and tumorigenesis. Here, we also find NRF2-target genes are differentially expressed during ADM. Among these, we focused on the increase in the gene coding for NADPH-producing enzyme, Glucose-6-phosphate dehydrogenase (G6PD). Using established mouse models of KrasG12D-driven pancreatic tumorigenesis and G6PD-deficiency, we find that mutant G6pd accelerates ADM and pancreatic intraepithelial neoplasia. Acceleration of cancer initiation with G6PD-deficiency is dependent on its NADPH-generating function in reactive oxygen species (ROS) management, as opposed to other outputs of the pentose phosphate pathway. Together, this work provides new insights into the function of metabolic pathways during early tumorigenesis.
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Affiliation(s)
- Megan D. Radyk
- Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, MI, USA
| | - Barbara S. Nelson
- Doctoral Program in Cancer Biology, University of Michigan, Ann Arbor, USA
| | - Christopher J. Halbrook
- Department of Molecular Biology and Biochemistry, University of California Irvine, Irvine, CA, USA
- University of California Irvine Chao Family Comprehensive Cancer Center, Orange, CA, USA
| | - Alexander Wood
- Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, MI, USA
| | - Brooke Lavoie
- Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, MI, USA
| | - Lucie Salvatore
- Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, MI, USA
| | - Gabriel Corfas
- Kresge Hearing Research Institute and Dept. of Otolaryngology, Head and Neck Surgery, University of Michigan, Ann Arbor, MI, USA
| | - Justin A. Colacino
- Department of Environmental Health Sciences, School of Public Health, University of Michigan, Ann Arbor, MI, USA
- Department of Nutritional Sciences, School of Public Health, University of Michigan, Ann Arbor, MI, USA
- Program in the Environment, College of Literature, Sciences, and the Arts, University of Michigan, Ann Arbor, MI, USA
- University of Michigan Rogel Cancer Center, University of Michigan, Ann Arbor, MI, USA
| | - Yatrik M. Shah
- Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, MI, USA
- University of Michigan Rogel Cancer Center, University of Michigan, Ann Arbor, MI, USA
- Department of Internal Medicine, Division of Gastroenterology and Hepatology, University of Michigan, Ann Arbor, MI, USA
| | - Howard C. Crawford
- Department of Surgery, Henry Ford Pancreatic Cancer Center, Henry Ford Health System, Detroit, MI, USA
| | - Costas A. Lyssiotis
- Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, MI, USA
- University of Michigan Rogel Cancer Center, University of Michigan, Ann Arbor, MI, USA
- Department of Internal Medicine, Division of Gastroenterology and Hepatology, University of Michigan, Ann Arbor, MI, USA
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2
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Halbrook CJ, Thurston G, Boyer S, Anaraki C, Jiménez JA, McCarthy A, Steele NG, Kerk SA, Hong HS, Lin L, Law FV, Felton C, Scipioni L, Sajjakulnukit P, Andren A, Beutel AK, Singh R, Nelson BS, Van Den Bergh F, Krall AS, Mullen PJ, Zhang L, Batra S, Morton JP, Stanger BZ, Christofk HR, Digman MA, Beard DA, Viale A, Zhang J, Crawford HC, Pasca di Magliano M, Jorgensen C, Lyssiotis CA. Differential integrated stress response and asparagine production drive symbiosis and therapy resistance of pancreatic adenocarcinoma cells. Nat Cancer 2022; 3:1386-1403. [PMID: 36411320 PMCID: PMC9701142 DOI: 10.1038/s43018-022-00463-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/07/2022] [Accepted: 10/12/2022] [Indexed: 11/22/2022]
Abstract
The pancreatic tumor microenvironment drives deregulated nutrient availability. Accordingly, pancreatic cancer cells require metabolic adaptations to survive and proliferate. Pancreatic cancer subtypes have been characterized by transcriptional and functional differences, with subtypes reported to exist within the same tumor. However, it remains unclear if this diversity extends to metabolic programming. Here, using metabolomic profiling and functional interrogation of metabolic dependencies, we identify two distinct metabolic subclasses among neoplastic populations within individual human and mouse tumors. Furthermore, these populations are poised for metabolic cross-talk, and in examining this, we find an unexpected role for asparagine supporting proliferation during limited respiration. Constitutive GCN2 activation permits ATF4 signaling in one subtype, driving excess asparagine production. Asparagine release provides resistance during impaired respiration, enabling symbiosis. Functionally, availability of exogenous asparagine during limited respiration indirectly supports maintenance of aspartate pools, a rate-limiting biosynthetic precursor. Conversely, depletion of extracellular asparagine with PEG-asparaginase sensitizes tumors to mitochondrial targeting with phenformin.
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Affiliation(s)
- Christopher J Halbrook
- Department of Molecular Biology and Biochemistry, University of California Irvine, Irvine, CA, USA.
- University of California Irvine Chao Family Comprehensive Cancer Center, Orange, CA, USA.
- Department of Molecular & Integrative Physiology, University of Michigan, Ann Arbor, MI, USA.
- Department of Molecular Biology and Biochemistry, University of California Irvine, Irvine, CA, USA.
| | - Galloway Thurston
- Department of Molecular & Integrative Physiology, University of Michigan, Ann Arbor, MI, USA
| | - Seth Boyer
- Department of Molecular & Integrative Physiology, University of Michigan, Ann Arbor, MI, USA
| | - Cecily Anaraki
- Department of Molecular Biology and Biochemistry, University of California Irvine, Irvine, CA, USA
| | - Jennifer A Jiménez
- Department of Molecular & Integrative Physiology, University of Michigan, Ann Arbor, MI, USA
| | - Amy McCarthy
- Cancer Research UK Manchester Institute, University of Manchester, Manchester, UK
| | - Nina G Steele
- Department of Surgery, University of Michigan, Ann Arbor, MI, USA
- Department of Surgery, Henry Ford Health System, Detroit, MI, USA
| | - Samuel A Kerk
- Department of Molecular & Integrative Physiology, University of Michigan, Ann Arbor, MI, USA
| | - Hanna S Hong
- Department of Molecular & Integrative Physiology, University of Michigan, Ann Arbor, MI, USA
| | - Lin Lin
- Department of Molecular & Integrative Physiology, University of Michigan, Ann Arbor, MI, USA
| | - Fiona V Law
- Department of Molecular Biology and Biochemistry, University of California Irvine, Irvine, CA, USA
| | - Catherine Felton
- Cancer Research UK Manchester Institute, University of Manchester, Manchester, UK
| | - Lorenzo Scipioni
- Department of Biomedical Engineering, University of California Irvine, Irvine, CA, USA
| | - Peter Sajjakulnukit
- Department of Molecular & Integrative Physiology, University of Michigan, Ann Arbor, MI, USA
| | - Anthony Andren
- Department of Molecular & Integrative Physiology, University of Michigan, Ann Arbor, MI, USA
| | - Alica K Beutel
- Department of Molecular Biology and Biochemistry, University of California Irvine, Irvine, CA, USA
| | - Rima Singh
- Department of Molecular Biology and Biochemistry, University of California Irvine, Irvine, CA, USA
| | - Barbara S Nelson
- Department of Molecular & Integrative Physiology, University of Michigan, Ann Arbor, MI, USA
| | - Fran Van Den Bergh
- Department of Molecular & Integrative Physiology, University of Michigan, Ann Arbor, MI, USA
| | - Abigail S Krall
- Department of Biological Chemistry, University of California Los Angeles, Los Angeles, CA, USA
| | - Peter J Mullen
- Department of Biological Chemistry, University of California Los Angeles, Los Angeles, CA, USA
| | - Li Zhang
- Department of Molecular & Integrative Physiology, University of Michigan, Ann Arbor, MI, USA
| | - Sandeep Batra
- Riley Hospital for Children at Indiana University Health, Indianapolis, IN, USA
| | - Jennifer P Morton
- Cancer Research UK Beatson Institute and Institute of Cancer Sciences, University of Glasgow, Glasgow, UK
| | - Ben Z Stanger
- Gastroenterology Division, Department of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Heather R Christofk
- Department of Biological Chemistry, University of California Los Angeles, Los Angeles, CA, USA
| | - Michelle A Digman
- Department of Biomedical Engineering, University of California Irvine, Irvine, CA, USA
| | - Daniel A Beard
- Department of Molecular & Integrative Physiology, University of Michigan, Ann Arbor, MI, USA
| | - Andrea Viale
- Department of Genomic Medicine, Division of Cancer Medicine, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
| | - Ji Zhang
- Herman B. Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Howard C Crawford
- Department of Molecular & Integrative Physiology, University of Michigan, Ann Arbor, MI, USA
- Department of Surgery, Henry Ford Health System, Detroit, MI, USA
| | - Marina Pasca di Magliano
- Department of Surgery, University of Michigan, Ann Arbor, MI, USA
- University of Michigan Rogel Cancer Center, University of Michigan, Ann Arbor, MI, USA
| | - Claus Jorgensen
- Cancer Research UK Manchester Institute, University of Manchester, Manchester, UK
| | - Costas A Lyssiotis
- Department of Molecular & Integrative Physiology, University of Michigan, Ann Arbor, MI, USA.
- University of Michigan Rogel Cancer Center, University of Michigan, Ann Arbor, MI, USA.
- Department of Internal Medicine, Division of Gastroenterology and Hepatology, University of Michigan, Ann Arbor, MI, USA.
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3
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Kerk SA, Lin L, Myers AL, Sutton DJ, Andren A, Sajjakulnukit P, Zhang L, Zhang Y, Jiménez JA, Nelson BS, Chen B, Robinson A, Thurston G, Kemp SB, Steele NG, Hoffman MT, Wen HJ, Long D, Ackenhusen SE, Ramos J, Gao X, Nwosu ZC, Galban S, Halbrook CJ, Lombard DB, Piwnica-Worms DR, Ying H, Pasca di Magliano M, Crawford HC, Shah YM, Lyssiotis CA. Metabolic requirement for GOT2 in pancreatic cancer depends on environmental context. eLife 2022; 11:e73245. [PMID: 35815941 PMCID: PMC9328765 DOI: 10.7554/elife.73245] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2021] [Accepted: 07/09/2022] [Indexed: 12/24/2022] Open
Abstract
Mitochondrial glutamate-oxaloacetate transaminase 2 (GOT2) is part of the malate-aspartate shuttle, a mechanism by which cells transfer reducing equivalents from the cytosol to the mitochondria. GOT2 is a key component of mutant KRAS (KRAS*)-mediated rewiring of glutamine metabolism in pancreatic ductal adenocarcinoma (PDA). Here, we demonstrate that the loss of GOT2 disturbs redox homeostasis and halts proliferation of PDA cells in vitro. GOT2 knockdown (KD) in PDA cell lines in vitro induced NADH accumulation, decreased Asp and α-ketoglutarate (αKG) production, stalled glycolysis, disrupted the TCA cycle, and impaired proliferation. Oxidizing NADH through chemical or genetic means resolved the redox imbalance induced by GOT2 KD, permitting sustained proliferation. Despite a strong in vitro inhibitory phenotype, loss of GOT2 had no effect on tumor growth in xenograft PDA or autochthonous mouse models. We show that cancer-associated fibroblasts (CAFs), a major component of the pancreatic tumor microenvironment (TME), release the redox active metabolite pyruvate, and culturing GOT2 KD cells in CAF conditioned media (CM) rescued proliferation in vitro. Furthermore, blocking pyruvate import or pyruvate-to-lactate reduction prevented rescue of GOT2 KD in vitro by exogenous pyruvate or CAF CM. However, these interventions failed to sensitize xenografts to GOT2 KD in vivo, demonstrating the remarkable plasticity and differential metabolism deployed by PDA cells in vitro and in vivo. This emphasizes how the environmental context of distinct pre-clinical models impacts both cell-intrinsic metabolic rewiring and metabolic crosstalk with the TME.
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Affiliation(s)
- Samuel A Kerk
- Doctoral Program in Cancer Biology, University of Michigan-Ann ArborAnn ArborUnited States
| | - Lin Lin
- Department of Molecular and Integrative Physiology, University of Michigan-Ann ArborAnn ArborUnited States
| | - Amy L Myers
- Department of Molecular and Integrative Physiology, University of Michigan-Ann ArborAnn ArborUnited States
| | - Damien J Sutton
- Department of Molecular and Integrative Physiology, University of Michigan-Ann ArborAnn ArborUnited States
| | - Anthony Andren
- Department of Molecular and Integrative Physiology, University of Michigan-Ann ArborAnn ArborUnited States
| | - Peter Sajjakulnukit
- Doctoral Program in Cancer Biology, University of Michigan-Ann ArborAnn ArborUnited States
| | - Li Zhang
- Department of Molecular and Integrative Physiology, University of Michigan-Ann ArborAnn ArborUnited States
| | - Yaqing Zhang
- Department of Surgery, University of Michigan-Ann ArborAnn ArborUnited States
| | - Jennifer A Jiménez
- Doctoral Program in Cancer Biology, University of Michigan-Ann ArborAnn ArborUnited States
| | - Barbara S Nelson
- Doctoral Program in Cancer Biology, University of Michigan-Ann ArborAnn ArborUnited States
- Department of Molecular and Integrative Physiology, University of Michigan-Ann ArborAnn ArborUnited States
| | - Brandon Chen
- Department of Molecular and Integrative Physiology, University of Michigan-Ann ArborAnn ArborUnited States
| | - Anthony Robinson
- Department of Cell and Developmental Biology, University of Michigan-Ann ArborAnn ArborUnited States
| | - Galloway Thurston
- Department of Molecular and Integrative Physiology, University of Michigan-Ann ArborAnn ArborUnited States
| | - Samantha B Kemp
- Molecular and Cellular Pathology Graduate Program, University of Michigan-Ann ArborAnn ArborUnited States
| | - Nina G Steele
- Department of Cell and Developmental Biology, University of Michigan-Ann ArborAnn ArborUnited States
| | - Megan T Hoffman
- Department of Molecular and Integrative Physiology, University of Michigan-Ann ArborAnn ArborUnited States
| | - Hui-Ju Wen
- Department of Molecular and Integrative Physiology, University of Michigan-Ann ArborAnn ArborUnited States
| | - Daniel Long
- Department of Molecular and Integrative Physiology, University of Michigan-Ann ArborAnn ArborUnited States
| | - Sarah E Ackenhusen
- Program in Chemical Biology, University of Michigan-Ann ArborAnn ArborUnited States
| | - Johanna Ramos
- Department of Molecular and Integrative Physiology, University of Michigan-Ann ArborAnn ArborUnited States
| | - Xiaohua Gao
- Department of Molecular and Integrative Physiology, University of Michigan-Ann ArborAnn ArborUnited States
| | - Zeribe C Nwosu
- Department of Molecular and Integrative Physiology, University of Michigan-Ann ArborAnn ArborUnited States
| | - Stefanie Galban
- Department of Radiology, University of MichiganAnn ArborUnited States
- Rogel Cancer Center, University of MichiganAnn ArborUnited States
| | - Christopher J Halbrook
- Department of Molecular and Integrative Physiology, University of Michigan-Ann ArborAnn ArborUnited States
| | - David B Lombard
- Department of Pathology and Institute of Gerontology, University of MichiganAnn ArborUnited States
| | - David R Piwnica-Worms
- Department of Cancer Systems Imaging, University of Texas MD Anderson Cancer CenterHoustonUnited States
| | - Haoqiang Ying
- Department of Molecular and Cellular Oncology, University of Texas MD Anderson Cancer CenterHoustonUnited States
| | - Marina Pasca di Magliano
- Department of Surgery, University of Michigan-Ann ArborAnn ArborUnited States
- Rogel Cancer Center, University of MichiganAnn ArborUnited States
| | - Howard C Crawford
- Department of Molecular and Integrative Physiology, University of Michigan-Ann ArborAnn ArborUnited States
- Rogel Cancer Center, University of MichiganAnn ArborUnited States
| | - Yatrik M Shah
- Department of Molecular and Integrative Physiology, University of Michigan-Ann ArborAnn ArborUnited States
- Rogel Cancer Center, University of MichiganAnn ArborUnited States
- Department of Internal Medicine, Division of Gastroenterology and Hepatology, University of MichiganAnn ArborUnited States
| | - Costas A Lyssiotis
- Doctoral Program in Cancer Biology, University of Michigan-Ann ArborAnn ArborUnited States
- Department of Molecular and Integrative Physiology, University of Michigan-Ann ArborAnn ArborUnited States
- Rogel Cancer Center, University of MichiganAnn ArborUnited States
- Department of Internal Medicine, Division of Gastroenterology and Hepatology, University of MichiganAnn ArborUnited States
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4
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Zhou W, Yao Y, Scott AJ, Wilder-Romans K, Dresser JJ, Werner CK, Sun H, Pratt D, Sajjakulnukit P, Zhao SG, Davis M, Nelson BS, Halbrook CJ, Zhang L, Gatto F, Umemura Y, Walker AK, Kachman M, Sarkaria JN, Xiong J, Morgan MA, Rehemtualla A, Castro MG, Lowenstein P, Chandrasekaran S, Lawrence TS, Lyssiotis CA, Wahl DR. Purine metabolism regulates DNA repair and therapy resistance in glioblastoma. Nat Commun 2020; 11:3811. [PMID: 32732914 PMCID: PMC7393131 DOI: 10.1038/s41467-020-17512-x] [Citation(s) in RCA: 92] [Impact Index Per Article: 23.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2020] [Accepted: 07/02/2020] [Indexed: 02/07/2023] Open
Abstract
Intratumoral genomic heterogeneity in glioblastoma (GBM) is a barrier to overcoming therapy resistance. Treatments that are effective independent of genotype are urgently needed. By correlating intracellular metabolite levels with radiation resistance across dozens of genomically-distinct models of GBM, we find that purine metabolites, especially guanylates, strongly correlate with radiation resistance. Inhibiting GTP synthesis radiosensitizes GBM cells and patient-derived neurospheres by impairing DNA repair. Likewise, administration of exogenous purine nucleosides protects sensitive GBM models from radiation by promoting DNA repair. Neither modulating pyrimidine metabolism nor purine salvage has similar effects. An FDA-approved inhibitor of GTP synthesis potentiates the effects of radiation in flank and orthotopic patient-derived xenograft models of GBM. High expression of the rate-limiting enzyme of de novo GTP synthesis is associated with shorter survival in GBM patients. These findings indicate that inhibiting purine synthesis may be a promising strategy to overcome therapy resistance in this genomically heterogeneous disease. Targeting genotype-independent abnormalities may overcome therapy resistance in glioblastoma despite intratumoral genomic heterogeneity. Here, the authors show that glioblastoma radiation resistance is promoted by purine metabolism and can be overcome by inhibitors of purine synthesis.
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Affiliation(s)
- Weihua Zhou
- Department of Radiation Oncology, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Yangyang Yao
- Department of Radiation Oncology, University of Michigan, Ann Arbor, MI, 48109, USA.,Department of Oncology, the First Affiliated Hospital of Nanchang University, Nanchang, 330006, Jiangxi, PR China
| | - Andrew J Scott
- Department of Radiation Oncology, University of Michigan, Ann Arbor, MI, 48109, USA.,Rogel Cancer Center, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Kari Wilder-Romans
- Department of Radiation Oncology, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Joseph J Dresser
- Department of Radiation Oncology, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Christian K Werner
- Department of Radiation Oncology, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Hanshi Sun
- Department of Radiation Oncology, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Drew Pratt
- Department of Pathology, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Peter Sajjakulnukit
- Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Shuang G Zhao
- Department of Radiation Oncology, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Mary Davis
- Department of Radiation Oncology, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Barbara S Nelson
- Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Christopher J Halbrook
- Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Li Zhang
- Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Francesco Gatto
- Department of Biology and Biological Engineering, Chalmers University of Technology, 41296, Göteborg, Sweden
| | - Yoshie Umemura
- Rogel Cancer Center, University of Michigan, Ann Arbor, MI, 48109, USA.,Department of Neurology, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Angela K Walker
- Biomedical Research Core Facilities, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Maureen Kachman
- Biomedical Research Core Facilities, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Jann N Sarkaria
- Department of Radiation Oncology, Mayo Clinic, Rochester, MN, 55902, USA
| | - Jianping Xiong
- Department of Oncology, the First Affiliated Hospital of Nanchang University, Nanchang, 330006, Jiangxi, PR China
| | - Meredith A Morgan
- Department of Radiation Oncology, University of Michigan, Ann Arbor, MI, 48109, USA.,Rogel Cancer Center, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Alnawaz Rehemtualla
- Department of Radiation Oncology, University of Michigan, Ann Arbor, MI, 48109, USA.,Rogel Cancer Center, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Maria G Castro
- Rogel Cancer Center, University of Michigan, Ann Arbor, MI, 48109, USA.,Department of Neurosurgery, University of Michigan, Ann Arbor, MI, 48109, USA.,Department of Cell and Developmental Biology, University of Michigan Medical School, Ann Arbor, MI, 48109, USA
| | - Pedro Lowenstein
- Rogel Cancer Center, University of Michigan, Ann Arbor, MI, 48109, USA.,Department of Neurosurgery, University of Michigan, Ann Arbor, MI, 48109, USA.,Department of Cell and Developmental Biology, University of Michigan Medical School, Ann Arbor, MI, 48109, USA
| | - Sriram Chandrasekaran
- Rogel Cancer Center, University of Michigan, Ann Arbor, MI, 48109, USA.,Department of Biomedical Engineering, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Theodore S Lawrence
- Department of Radiation Oncology, University of Michigan, Ann Arbor, MI, 48109, USA.,Rogel Cancer Center, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Costas A Lyssiotis
- Rogel Cancer Center, University of Michigan, Ann Arbor, MI, 48109, USA.,Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, MI, 48109, USA.,Department of Internal Medicine, Division of Gastroenterology and Hepatology, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Daniel R Wahl
- Department of Radiation Oncology, University of Michigan, Ann Arbor, MI, 48109, USA. .,Rogel Cancer Center, University of Michigan, Ann Arbor, MI, 48109, USA.
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5
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Nelson BS, Lin L, Kremer DM, Sousa CM, Cotta-Ramusino C, Myers A, Ramos J, Gao T, Kovalenko I, Wilder-Romans K, Dresser J, Davis M, Lee HJ, Nwosu ZC, Campit S, Mashadova O, Nicolay BN, Tolstyka ZP, Halbrook CJ, Chandrasekaran S, Asara JM, Crawford HC, Cantley LC, Kimmelman AC, Wahl DR, Lyssiotis CA. Tissue of origin dictates GOT1 dependence and confers synthetic lethality to radiotherapy. Cancer Metab 2020; 8:1. [PMID: 31908776 PMCID: PMC6941320 DOI: 10.1186/s40170-019-0202-2] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2019] [Accepted: 11/20/2019] [Indexed: 12/20/2022] Open
Abstract
BACKGROUND Metabolic programs in cancer cells are influenced by genotype and the tissue of origin. We have previously shown that central carbon metabolism is rewired in pancreatic ductal adenocarcinoma (PDA) to support proliferation through a glutamate oxaloacetate transaminase 1 (GOT1)-dependent pathway. METHODS We utilized a doxycycline-inducible shRNA-mediated strategy to knockdown GOT1 in PDA and colorectal cancer (CRC) cell lines and tumor models of similar genotype. These cells were analyzed for the ability to form colonies and tumors to test if tissue type impacted GOT1 dependence. Additionally, the ability of GOT1 to impact the response to chemo- and radiotherapy was assessed. Mechanistically, the associated specimens were examined using a combination of steady-state and stable isotope tracing metabolomics strategies and computational modeling. Statistics were calculated using GraphPad Prism 7. One-way ANOVA was performed for experiments comparing multiple groups with one changing variable. Student's t test (unpaired, two-tailed) was performed when comparing two groups to each other. Metabolomics data comparing three PDA and three CRC cell lines were analyzed by performing Student's t test (unpaired, two-tailed) between all PDA metabolites and CRC metabolites. RESULTS While PDA exhibits profound growth inhibition upon GOT1 knockdown, we found CRC to be insensitive. In PDA, but not CRC, GOT1 inhibition disrupted glycolysis, nucleotide metabolism, and redox homeostasis. These insights were leveraged in PDA, where we demonstrate that radiotherapy potently enhanced the effect of GOT1 inhibition on tumor growth. CONCLUSIONS Taken together, these results illustrate the role of tissue type in dictating metabolic dependencies and provide new insights for targeting metabolism to treat PDA.
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Affiliation(s)
- Barbara S. Nelson
- Department of Molecular and Integrative Physiology, University of Michigan Medical School, Ann Arbor, MI 48109 USA
- Division of Genomic Stability and DNA Repair, Department of Radiation Oncology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA 02215 USA
- Experimental Therapeutics Core and Belfer Center for Applied Cancer Science, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA 02215 USA
- Department of Radiation Oncology, University of Michigan Medical School, Ann Arbor, MI 48109 USA
- Department of Biomedical Engineering, University of Michigan Medical School, Ann Arbor, MI 48109 USA
- Meyer Cancer Center, Weill Cornell Medicine, New York City, NY 10065 USA
- Agios Pharmaceuticals, Inc., Cambridge, MA 02139 USA
- Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA 02115 USA
- Center for Computational Medicine and Bioinformatics, University of Michigan Medical School, Ann Arbor, MI 48109 USA
- Rogel Cancer Center, University of Michigan Medical School, Ann Arbor, MI 48109 USA
- Department of Internal Medicine, Division of Gastroenterology and Hepatology, University of Michigan Medical School, Ann Arbor, MI 48109 USA
- Department of Radiation Oncology, Perlmutter Cancer Center, NYU Langone Medical Center, New York, NY 10016 USA
| | - Lin Lin
- Department of Molecular and Integrative Physiology, University of Michigan Medical School, Ann Arbor, MI 48109 USA
- Division of Genomic Stability and DNA Repair, Department of Radiation Oncology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA 02215 USA
- Experimental Therapeutics Core and Belfer Center for Applied Cancer Science, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA 02215 USA
- Department of Radiation Oncology, University of Michigan Medical School, Ann Arbor, MI 48109 USA
- Department of Biomedical Engineering, University of Michigan Medical School, Ann Arbor, MI 48109 USA
- Meyer Cancer Center, Weill Cornell Medicine, New York City, NY 10065 USA
- Agios Pharmaceuticals, Inc., Cambridge, MA 02139 USA
- Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA 02115 USA
- Center for Computational Medicine and Bioinformatics, University of Michigan Medical School, Ann Arbor, MI 48109 USA
- Rogel Cancer Center, University of Michigan Medical School, Ann Arbor, MI 48109 USA
- Department of Internal Medicine, Division of Gastroenterology and Hepatology, University of Michigan Medical School, Ann Arbor, MI 48109 USA
- Department of Radiation Oncology, Perlmutter Cancer Center, NYU Langone Medical Center, New York, NY 10016 USA
| | - Daniel M. Kremer
- Department of Molecular and Integrative Physiology, University of Michigan Medical School, Ann Arbor, MI 48109 USA
| | - Cristovão M. Sousa
- Division of Genomic Stability and DNA Repair, Department of Radiation Oncology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA 02215 USA
- Agios Pharmaceuticals, Inc., Cambridge, MA 02139 USA
| | - Cecilia Cotta-Ramusino
- Experimental Therapeutics Core and Belfer Center for Applied Cancer Science, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA 02215 USA
| | - Amy Myers
- Department of Molecular and Integrative Physiology, University of Michigan Medical School, Ann Arbor, MI 48109 USA
| | - Johanna Ramos
- Department of Molecular and Integrative Physiology, University of Michigan Medical School, Ann Arbor, MI 48109 USA
| | - Tina Gao
- Department of Molecular and Integrative Physiology, University of Michigan Medical School, Ann Arbor, MI 48109 USA
| | - Ilya Kovalenko
- Department of Molecular and Integrative Physiology, University of Michigan Medical School, Ann Arbor, MI 48109 USA
| | - Kari Wilder-Romans
- Department of Radiation Oncology, University of Michigan Medical School, Ann Arbor, MI 48109 USA
| | - Joseph Dresser
- Department of Radiation Oncology, University of Michigan Medical School, Ann Arbor, MI 48109 USA
| | - Mary Davis
- Department of Radiation Oncology, University of Michigan Medical School, Ann Arbor, MI 48109 USA
| | - Ho-Joon Lee
- Department of Molecular and Integrative Physiology, University of Michigan Medical School, Ann Arbor, MI 48109 USA
| | - Zeribe C. Nwosu
- Department of Molecular and Integrative Physiology, University of Michigan Medical School, Ann Arbor, MI 48109 USA
| | - Scott Campit
- Department of Biomedical Engineering, University of Michigan Medical School, Ann Arbor, MI 48109 USA
| | - Oksana Mashadova
- Meyer Cancer Center, Weill Cornell Medicine, New York City, NY 10065 USA
| | | | - Zachary P. Tolstyka
- Department of Molecular and Integrative Physiology, University of Michigan Medical School, Ann Arbor, MI 48109 USA
| | - Christopher J. Halbrook
- Department of Molecular and Integrative Physiology, University of Michigan Medical School, Ann Arbor, MI 48109 USA
| | - Sriram Chandrasekaran
- Department of Biomedical Engineering, University of Michigan Medical School, Ann Arbor, MI 48109 USA
- Center for Computational Medicine and Bioinformatics, University of Michigan Medical School, Ann Arbor, MI 48109 USA
- Rogel Cancer Center, University of Michigan Medical School, Ann Arbor, MI 48109 USA
| | - John M. Asara
- Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA 02115 USA
| | - Howard C. Crawford
- Department of Molecular and Integrative Physiology, University of Michigan Medical School, Ann Arbor, MI 48109 USA
- Rogel Cancer Center, University of Michigan Medical School, Ann Arbor, MI 48109 USA
- Department of Internal Medicine, Division of Gastroenterology and Hepatology, University of Michigan Medical School, Ann Arbor, MI 48109 USA
| | - Lewis C. Cantley
- Meyer Cancer Center, Weill Cornell Medicine, New York City, NY 10065 USA
| | - Alec C. Kimmelman
- Division of Genomic Stability and DNA Repair, Department of Radiation Oncology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA 02215 USA
- Department of Radiation Oncology, Perlmutter Cancer Center, NYU Langone Medical Center, New York, NY 10016 USA
| | - Daniel R. Wahl
- Department of Radiation Oncology, University of Michigan Medical School, Ann Arbor, MI 48109 USA
- Rogel Cancer Center, University of Michigan Medical School, Ann Arbor, MI 48109 USA
| | - Costas A. Lyssiotis
- Department of Molecular and Integrative Physiology, University of Michigan Medical School, Ann Arbor, MI 48109 USA
- Rogel Cancer Center, University of Michigan Medical School, Ann Arbor, MI 48109 USA
- Department of Internal Medicine, Division of Gastroenterology and Hepatology, University of Michigan Medical School, Ann Arbor, MI 48109 USA
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Halbrook CJ, Nelson BS, Lysstiotis CA. Metabolism Drives Carcinogenesis and Maintenance of Pancreatic Tumors. Cancer Discov 2019; 9:326-328. [PMID: 30824487 DOI: 10.1158/2159-8290.cd-19-0034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
In this issue of Cancer Discovery, Carrer and colleagues find that early events in pancreatic tumorigenesis are driven by altered acetyl-CoA metabolism, where targeting this axis in established cancer models impairs tumor growth. This work provides new insights into the roles of acetyl-CoA in pancreatic cancer and underscores the value of studying early events in carcinogenesis to yield new treatment strategies.See related article by Carrer et al., p. 416.
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Affiliation(s)
- Christopher J Halbrook
- Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, Michigan
| | - Barbara S Nelson
- Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, Michigan.,Cancer Biology Graduate Program, University of Michigan, Ann Arbor, Michigan
| | - Costas A Lysstiotis
- Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, Michigan. .,Rogel Cancer Center, University of Michigan, Ann Arbor, Michigan.,Department of Internal Medicine, Division of Gastroenterology, University of Michigan, Ann Arbor, Michigan
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7
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Halbrook CJ, Pontious C, Kovalenko I, Lapienyte L, Dreyer S, Lee HJ, Thurston G, Zhang Y, Lazarus J, Sajjakulnukit P, Hong HS, Kremer DM, Nelson BS, Kemp S, Zhang L, Chang D, Biankin A, Shi J, Frankel TL, Crawford HC, Morton JP, Pasca di Magliano M, Lyssiotis CA. Macrophage-Released Pyrimidines Inhibit Gemcitabine Therapy in Pancreatic Cancer. Cell Metab 2019; 29:1390-1399.e6. [PMID: 30827862 PMCID: PMC6602533 DOI: 10.1016/j.cmet.2019.02.001] [Citation(s) in RCA: 243] [Impact Index Per Article: 48.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/04/2018] [Revised: 12/19/2018] [Accepted: 01/31/2019] [Indexed: 01/04/2023]
Abstract
Pancreatic ductal adenocarcinoma (PDA) is characterized by abundant infiltration of tumor-associated macrophages (TAMs). TAMs have been reported to drive resistance to gemcitabine, a frontline chemotherapy in PDA, though the mechanism of this resistance remains unclear. Profiling metabolite exchange, we demonstrate that macrophages programmed by PDA cells release a spectrum of pyrimidine species. These include deoxycytidine, which inhibits gemcitabine through molecular competition at the level of drug uptake and metabolism. Accordingly, genetic or pharmacological depletion of TAMs in murine models of PDA sensitizes these tumors to gemcitabine. Consistent with this, patients with low macrophage burden demonstrate superior response to gemcitabine treatment. Together, these findings provide insights into the role of macrophages in pancreatic cancer therapy and have potential to inform the design of future treatments. Additionally, we report that pyrimidine release is a general function of alternatively activated macrophage cells, suggesting an unknown physiological role of pyrimidine exchange by immune cells.
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Affiliation(s)
- Christopher J Halbrook
- Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, MI 48109, USA
| | - Corbin Pontious
- Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, MI 48109, USA
| | - Ilya Kovalenko
- Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, MI 48109, USA
| | | | - Stephan Dreyer
- West of Scotland Pancreatic Unit, Glasgow Royal Infirmary, Glasgow G61 1QH, UK; Institute of Cancer Sciences, University of Glasgow, Glasgow G61 1QH, UK
| | - Ho-Joon Lee
- Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, MI 48109, USA; University of Michigan Rogel Cancer Center, University of Michigan, Ann Arbor, MI 48109, USA
| | - Galloway Thurston
- Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, MI 48109, USA
| | - Yaqing Zhang
- Department of Surgery, University of Michigan, Ann Arbor, MI 48109, USA
| | - Jenny Lazarus
- Department of Surgery, University of Michigan, Ann Arbor, MI 48109, USA
| | - Peter Sajjakulnukit
- Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, MI 48109, USA
| | - Hanna S Hong
- Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, MI 48109, USA
| | - Daniel M Kremer
- Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, MI 48109, USA
| | - Barbara S Nelson
- Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, MI 48109, USA
| | - Samantha Kemp
- Department of Pathology, University of Michigan, Ann Arbor, MI 48109, USA
| | - Li Zhang
- Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, MI 48109, USA
| | - David Chang
- West of Scotland Pancreatic Unit, Glasgow Royal Infirmary, Glasgow G61 1QH, UK; Institute of Cancer Sciences, University of Glasgow, Glasgow G61 1QH, UK
| | - Andrew Biankin
- West of Scotland Pancreatic Unit, Glasgow Royal Infirmary, Glasgow G61 1QH, UK; Institute of Cancer Sciences, University of Glasgow, Glasgow G61 1QH, UK
| | - Jiaqi Shi
- Department of Pathology, University of Michigan, Ann Arbor, MI 48109, USA
| | - Timothy L Frankel
- University of Michigan Rogel Cancer Center, University of Michigan, Ann Arbor, MI 48109, USA; Department of Surgery, University of Michigan, Ann Arbor, MI 48109, USA
| | - Howard C Crawford
- Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, MI 48109, USA; University of Michigan Rogel Cancer Center, University of Michigan, Ann Arbor, MI 48109, USA; Department of Internal Medicine, Division of Gastroenterology and Hepatology, University of Michigan, Ann Arbor, MI 48109, USA
| | - Jennifer P Morton
- Cancer Research UK, Beatson Institute, Glasgow G61 1BD, UK; Institute of Cancer Sciences, University of Glasgow, Glasgow G61 1QH, UK
| | - Marina Pasca di Magliano
- University of Michigan Rogel Cancer Center, University of Michigan, Ann Arbor, MI 48109, USA; Department of Surgery, University of Michigan, Ann Arbor, MI 48109, USA
| | - Costas A Lyssiotis
- Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, MI 48109, USA; University of Michigan Rogel Cancer Center, University of Michigan, Ann Arbor, MI 48109, USA; Department of Internal Medicine, Division of Gastroenterology and Hepatology, University of Michigan, Ann Arbor, MI 48109, USA.
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8
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Affiliation(s)
- Barbara S Nelson
- Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, MI, USA
| | - Daniel M Kremer
- Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, MI, USA
| | - Costas A Lyssiotis
- Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, MI, USA. .,Rogel Cancer Center and Department of Internal Medicine, Division of Gastroenterology and Hepatology, University of Michigan, Ann Arbor, MI, USA.
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9
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Meyer KA, Neeley CK, Baker NA, Washabaugh AR, Flesher CG, Nelson BS, Frankel TL, Lumeng CN, Lyssiotis CA, Wynn ML, Rhim AD, O'Rourke RW. Adipocytes promote pancreatic cancer cell proliferation via glutamine transfer. Biochem Biophys Rep 2016; 7:144-149. [PMID: 27617308 PMCID: PMC5014359 DOI: 10.1016/j.bbrep.2016.06.004] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
Adipocytes promote progression of multiple cancers, but their role in pancreatic intraepithelial neoplasia (PanIN) and ductal adenocarcinoma (PDAC) is poorly defined. Nutrient transfer is a mechanism underlying stromal cell-cancer crosstalk. We studied the role of adipocytes in regulating in vitro PanIN and PDAC cell proliferation with a focus on glutamine metabolism. Murine 3T3L1 adipocytes were used to model adipocytes. Cell lines derived from PKCY mice were used to model PanIN and PDAC. Co-culture was used to study the effect of adipocytes on PanIN and PDAC cell proliferation in response to manipulation of glutamine metabolism. Glutamine secretion was measured with a bioanalyzer. Western blotting was used to study the effect of PanIN and PDAC cells on expression of glutamine-related enzymes in adipocytes. Adipocytes promote proliferation of PanIN and PDAC cells, an effect that was amplified in nutrient-poor conditions. Adipocytes secrete glutamine and rescue PanIN and PDAC cell proliferation in the absence of glutamine, an effect that was glutamine synthetase-dependent and involved PDAC cell-induced down-regulation of glutaminase expression in adipocytes. These findings suggest glutamine transfer as a potential mechanism underlying adipocyte-induced PanIN and PDAC cell proliferation.
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Affiliation(s)
- Kevin A Meyer
- Department of Surgery, University of Michigan Medical School, Ann Arbor, MI, USA
| | - Christopher K Neeley
- Department of Surgery, University of Michigan Medical School, Ann Arbor, MI, USA
| | - Nicki A Baker
- Department of Surgery, University of Michigan Medical School, Ann Arbor, MI, USA
| | | | - Carmen G Flesher
- Undergraduate Research Opportunity Program, University of Michigan, Ann Arbor, MI, USA
| | - Barbara S Nelson
- Department of Molecular and Integrative Physiology, University of Michigan Medical School, Ann Arbor, MI, USA
| | - Timothy L Frankel
- Department of Surgery, University of Michigan Medical School, Ann Arbor, MI, USA; Department of Surgery, Ann Arbor Veteran's Administration Hospital, Ann Arbor, MI, USA
| | - Carey N Lumeng
- Department of Pediatrics and Communicable Diseases, University of Michigan Medical School, Ann Arbor, MI, USA
| | - Costas A Lyssiotis
- Department of Internal Medicine, University of Michigan Medical School, Ann Arbor, MI, USA; Department of Molecular and Integrative Physiology, University of Michigan Medical School, Ann Arbor, MI, USA
| | - Michelle L Wynn
- Department of Internal Medicine, University of Michigan Medical School, Ann Arbor, MI, USA; Division of Hematology and Oncology and Comprehensive Cancer Center, University of Michigan Medical School, Ann Arbor, MI, USA
| | - Andrew D Rhim
- Department of Internal Medicine, University of Michigan Medical School, Ann Arbor, MI, USA
| | - Robert W O'Rourke
- Department of Surgery, University of Michigan Medical School, Ann Arbor, MI, USA; Department of Surgery, Ann Arbor Veteran's Administration Hospital, Ann Arbor, MI, USA
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Takahashi TT, Keller CH, Nelson BS, Spitzer MW, Bala ADS, Whitchurch EA. Object localization in cluttered acoustical environments. Biol Cybern 2008; 98:579-586. [PMID: 18491167 DOI: 10.1007/s00422-008-0232-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2007] [Accepted: 03/15/2008] [Indexed: 05/26/2023]
Abstract
In nature, sounds from objects of interest arrive at the ears accompanied by sound waves from other actively emitting objects and by reflections off of nearby surfaces. Despite the fact that all of these waveforms sum at the eardrums, humans with normal hearing effortlessly segregate one sound source from another. Our laboratory is investigating the neural basis of this perceptual feat, often called the "cocktail party effect", using the barn owl as an animal model. The barn owl, renowned for its ability to localize sounds and its spatiotopic representation of auditory space, is an established model for spatial hearing. Here, we briefly review the neural basis of sound-localization of a single sound source in an anechoic environment and then generalize the ideas developed therein to cases in which there are multiple, concomitant sound sources and acoustical reflection.
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Affiliation(s)
- T T Takahashi
- Institute of Neuroscience, University of Oregon, Eugene, OR 97405, USA.
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Abstract
A case of cardiac septal abscess in a patient with a porcine bioprosthetic aortic valve who gradually developed a complete atrioventricular block on successive electrocardiograms (ECG) is reported. Emergency physicians should consider endocarditis with septal abscess in a patient with a prosthetic heart valve who presents with fever and a new conduction defect on ECG.
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Affiliation(s)
- J E Daniell
- Department of Emergency Medicine, Loma Linda University, CA 92354, USA
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Nelson BS, Roldan C. Clinicopathological conference: sudden-onset facial edema in an autistic child. Acad Emerg Med 2000; 7:1139-44. [PMID: 11015246 DOI: 10.1111/j.1553-2712.2000.tb01264.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- B S Nelson
- Department of Emergency Medicine, Loma Linda University Medical Center, Loma Linda, CA, USA.
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Nelson BS, Wampler KS. Systemic effects of trauma in clinic couples: an exploratory study of secondary trauma resulting from childhood abuse. J Marital Fam Ther 2000; 26:171-184. [PMID: 10776604 DOI: 10.1111/j.1752-0606.2000.tb00287.x] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Clinical literature suggests that those close to a trauma survivor may experience intrapersonal and interpersonal distress because of indirect or secondary effects of the trauma. The focus of this study is on the association between reported childhood physical and sexual abuse and current individual stress symptoms, relationship satisfaction, and family adjustment. The participants included 96 clinic couples who reported a history of childhood physical or sexual abuse in one or both partners and 65 clinic couples in which neither partner reported such abuse. Couples in which one or both partners reported childhood abuse reported significantly lower marital satisfaction, higher individual stress symptoms, and lower family cohesion than couples with no abuse history. No significant differences were found between individuals who reported a history of abuse and their partners who reported no history of childhood abuse, suggesting support for secondary trauma theory. Clinical and future research implications are discussed.
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Affiliation(s)
- B S Nelson
- School of Family Studies and Human Services, Kansas State University, Manhattan 66506-1403, USA.
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Abstract
Sound pressure level (SPL) has received little attention as a distance cue or signal for communication because of the methodological difficulty of determining source SPL from free-ranging signallers and because SPL is presumed to be unreliable as a distance cue. Eastern towhees, Pipilo erythrophthalmus (Emberizidae, Passeriformes), in south-central Florida give a simple call during territorial interactions. I obtained measurements of call-source SPL with a calibrated microphone positioned 100+/-10 cm from caged male eastern towhees. Measurements of source SPL were highly variable, but much of this variation can be predicted from measurements of call duration or call frequency variables (spectrotemporal variables). Male towhees accurately perceived the distance of a speaker after it played synthetic calls that matched the amplitude and structure of natural 84-dB and 78-dB call types. Subjects flew further in response to an attenuated (-6 or -12 dB) version of an otherwise identical 84-dB call and flew shorter in response to an amplified (+6 dB) version of this same call. Towhees misjudged speaker distance in approximately half of the trials that included a discrepancy (-6, -12 or +6 dB SPL) between playback source SPL and predicted spectrotemporal variables. These distance errors suggest that towhees assess auditory distance partly from the difference between perceived SPL and source SPL, determined from spectrotemporal variables. Copyright 2000 The Association for the Study of Animal Behaviour.
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Affiliation(s)
- BS Nelson
- Department of Biological Sciences, Florida International University
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Abstract
Betel nut is a common masticatory drug used in Far East Asia, India, and the South Pacific. It is used daily by 600 million people worldwide, yet is unknown to most Western physicians. As the world becomes more culturally and ethnically interconnected, emergency physicians will encounter the use of betel nut. Significant illness can be associated with its use, including asthma exacerbation, cholinergic crisis, cardiac arrhythmias, acute psychosis, milk-alkali syndrome, and oropharyngeal tumors. We describe its source, pharmacology, composition, presentation, and treatment in the emergency department.
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Affiliation(s)
- B S Nelson
- Department of Emergency Medicine, Loma Linda University Medical Center, Loma Linda, CA 92354, USA.
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Abstract
Small birds should localize sound poorly because small head size limits azimuth resolution and because the loose correlation of acoustic degradation with distance limits accurate estimation of auditory distance. We determined the accuracy of sound localization by a passerine bird in the field using an open-loop phonotaxis experiment. After hearing a playback of a conspecific contact call, eastern towhees, Pipilo erythrophthalmus, approached the silenced source. Mean auditory distance resolution was 7% of total speaker distance and mean azimuth resolution was +/-5 degrees. In a second experiment, we played birds the same calls rerecorded previously over the 10- or 20-m distance beyond each playback location. In 13 of 30 trials, the birds over-flew the speaker by a distance propotional to rerecording; but in 15 trials, approach distances were comparable to speaker distance despite the addition of distance simulated by attenuating and rerecording the calls. Signal-specific and location-specific distance cues are derived to explain the bimodal distribution of flight distances we observed. Copyright 1998 The Association for the Study of Animal Behaviour
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Affiliation(s)
- BS Nelson
- Department of Biological Sciences, Florida International University
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Nelson BS, Heiskell LE, Cemaj S, O'Callaghan TA, Koller CE. Traumatically injured Jehovah's Witnesses: a sixteen-year experience of treatment and transfusion dilemmas at a level I trauma center. J Trauma 1995; 39:681-5. [PMID: 7473954 DOI: 10.1097/00005373-199510000-00011] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Traumatically injured Jehovah's Witnesses pose difficult management problems because of their refusal to accept blood transfusions. This retrospective review of all inpatient traumatically injured Jehovah's Witnesses at a level I trauma center over the past 16 years revealed 77 patients with 92% blunt and 8% penetrating injuries. The primary physician was aware of their unique religious status in only 32% of cases. Transfusion was performed in only 4 (5.2%) cases even though it was desired by the physician in 11 (14%) cases. One transfusion was performed against the patient's will. One minor was transfused using a court order. Two transfusions were performed in the trauma room before the patients' religious status was known. Major changes in therapeutic plans were made as a result of the patients' Jehovah's Witness status in 10 cases (13%). Early knowledge of the patient's religious status is essential to optimize patient care.
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Affiliation(s)
- B S Nelson
- Department of Emergency Medicine, Loma Linda University Medical Center, California 92354, USA
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